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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Ítalo A. Cavalcanti de Oliveira Cursino Brandão Jacobina Nady Rocha Emerson de Lacerda Soares Nayara Brandão de Freitas Post-Graduate Program in Electrical Engineering (PPgEE) Federal University of Campina Grande (UFCG) Paraíba Brazil Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) Paraíba Brazil Electrical Engineering Department (DEE) Federal University of Paraíba (UFPB) Paraíba Brazil

In this paper a Wind Energy Conversion System based on Doubly Fed Induction Generator (DFIG) with series active compensator without additional transformer is proposed. The series compensator acts on the compensation of the grid voltages disturbance (harmonic distortion, voltage sag and voltage swell) in the DFIG stator voltages. The series active compensator is based on three H-bridge inverters operating with floating capacitors. The proposed control system regulates the floating capacitors voltages with no need for external sources. Simulation and experimental results are presented in order to evaluate the proposed system.

关键词： Voltage control Capacitors Power quality Stator windings Doubly fed induction generators Voltage fluctuations

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Hybrid Open-End and NPC AC Six-Phase Machine Drive Systems

Hybrid Open-End and NPC AC Six-Phase Machine Drive Systems

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IEEE Energy Conversion Congress and Exposition

作者： Victor F. M. B. Melo Cursino B. Jacobina Nady Rocha Post-Graduate Program in Electrical Engineering - PPgEE - COPELE - UFCG Campina Grande Paraiba Brazil Electrical Engineering Department - Federal University of Campina Grande - UFCG Campina Grande Paraiba Brazil Federal University of Paraiba - UFPB Joao Pessoa Paraiba Brazil

ISBN: (纸本)9781479957774

This paper presents two machine drive system based on a six-phase machine (SPM) and three-leg converters. The machine is composed of two three-phase groups. For the first configuration, one of the groups is connected to a three-leg converter and the other is connected to other two three-leg converters in an open-end winding configuration (see Fig. 4). For the second configuration, one of the groups is connected to a three-leg converter (similar to first one) and the other group is connected to a three-level NPC converter (see Fig. 5). Since the machine two groups are fed differently, the system topology is considered to be hybrid. The purpose of these topologies is to be an alternative configuration, being midway between the conventional six-leg inverter system (see Fig. 1) and the NPC six-leg inverter system (see Fig. 2) and Conventional twelve-leg Open-end inverter system (see Fig. 3). Compared with the conventional six-leg system, the proposed systems permits reducing the power processed by the semiconductor switches and their ratings, the dc-link voltage and the harmonic distortion. On the other hand, the proposed systems constitute less complex alternatives, compared with the open-end and NPC counterparts (see Fig. 3). PWM and control strategies are discussed. Simulation and experimental results are also presented.

关键词： drive train Figs Thyristors Converters machine six-phase Midway Inventors Harmonic distortion

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AC-DC-AC nine-phase machine drive system based on H-bridges and three-leg converters

AC-DC-AC nine-phase machine drive system based on H-bridges ...

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作者： Melo, Victor F.M.B. Jacobina, Cursino B. Braga-Filho, Edgar R. Cavalcanti, Rodolpho M. De Freitas, Isaac S. Macena, Roberto S. Carlos, Gregory A. De A. Post-Graduate Program in Electrical Engineering - PPgEE COPELE UFCG Brazil Federal University of Campina Grande - UFCG Campiña Grande Paraíba Brazil Federal University of Paraiba - UFPB Joao Pessoa Paraíba Brazil Federal Institute of Technology of Sergipe - IFSE Estancia Sergipe Brazil Federal Institute of Technology of Alagoas - IFAL Palmeira Dos Indios Alagoas Brazil

ISBN: (纸本)9781479940325

This paper presents an ac-dc-ac reversible nine-phase machine drive system. The grid side converter is composed of Y-connected single-phase bridges. As the machine is composed of three three-phase groups, a three-leg converters are connected separately to each group. The topology does not make use of input isolation transformers and reduces the power processed by converter switches when compared to that of conventional two-level converter. Moreover, harmonic distortion in voltages generated by the grid side converter is reduced when compared to conventional two-level converter. The model and the control strategy have been developed. Simulation and experimental results are also presented. © 2014 IEEE.

关键词： Electric inverters

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Development of a virtual reality environment for rehabilitation of tetraplegics 13

Development of a virtual reality environment for rehabilitat...

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13th International Conference on Biomedical Electronics and Devices, BIODEVICES 2020 - Part of 13th International Joint Conference on Biomedical engineering Systems and Technologies, BIOSTEC 2020

作者： Ginja, Gabriel Augusto Varoto, Renato Cliquet, Alberto Bioengineering Post Graduate Program University of São Paulo Av. Trabalhador São Carlense 400 São CarlosCEP 13566-590 Brazil Electrical and Computing Engineering Department University of São Paulo São Carlos SP Brazil Orthopedics and Traumatology Department Faculty of Medical Sciences University of Campinas Campinas SP Brazil

ISBN: (纸本)9789897583988

Treatments based on Virtual Reality have been successfully used in motor rehabilitation of issues such as Spinal Cord Injury and Stroke. Highly immersive Virtual environments combined with biofeedback can be utilized to train functional activities on patients with these motor disabilities. This work details the development of a portable Virtual Reality environment to train upper limbs activities on Spinal Cord Injury subjects. The Virtual Reality environment depicts a personalized physiotherapy room where the user trains elbow and shoulder by reaching 5 spots on table. Also the user have a biofeedback of both hands’ position. Finally this system will be integrated a pilot biomechanical analysis using The Motion Monitor system to compare a group of patients before and after a 6 week intervention with Virtual Reality. Copyright © 2020 by SCITEPRESS – Science and Technology Publications, Lda. All rights reserved.

关键词： Virtual reality

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Piecewise Polynomial Interpolation function approach for solving nonlinear programming problems with disjoint feasible regions: Mathematical proofs

arXiv

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arXiv 2020年

作者： Pinheiro, Ricardo B.N.M. Balbo, Antonio R. Nepomuceno, Leonardo Post-graduate program in Electrical Engineering Engineering Faculty Univ Estadual Paulista - UNESP Bauru–SP Brazil Department of Electrical Engineering in the Engineering Faculty Univ Estadual Paulista - UNESP Bauru–SP Brazil Department of Mathematics Science Faculty Univ Estadual Paulista - UNESP Bauru–SP Brazil

The Piecewise Polynomial Interpolation (PPI) function approach is aimed at solving nonlinear programming problems with disjoint feasible regions. In such problems, disjointedness is generally associated with prohibited operating zones, which correspond to bands of values that a variable is not allowed to assume. An analytical implication of such prohibited operating zones is to make the objective function, as well as its domain, discontinuous. The PPI function approach consists in replacing the constraints associated with prohibited operating zones by an equivalent set of equality and inequality constraints, thereby allowing the application of any efficient gradient-based optimization method for solving the equivalent problem. In this paper, we present the definition of the PPI function and provide the mathematical proofs for its properties. Copyright © 2020, The Authors. All rights reserved.

关键词： Constraint theory

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FPGA-based Implementation of Random Forest Classifier for sEMG Signal Classification

FPGA-based Implementation of Random Forest Classifier for sE...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Wagner Martins Leia B. Bagesteiro Tiago O. Weber Alexandre Balbinot Post-Graduate Program in Electrical Engineering Universidade Federal do Rio Grande do Sul Porto Alegre Brazil Department of Kinesiology San Francisco State University San Francisco CA USA

This paper proposes a method that combines a hardware description language and Random Forests theory, to develop a motion recognition embedded system. To validate this system, the Ninapro database DB2 was used as trai... 详细信息

ISBN: (数字)9798350371499

ISBN: (纸本)9798350371505

关键词： Training Accuracy VHDL Software algorithms Pattern classification Forestry Hardware Random forests Optimization Software development management

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Single-phase to three-phase induction generation system with two parallel single-phase half-bridge converters

Single-phase to three-phase induction generation system with...

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Brazilian Power Electronics Conference, COBEP

作者： Nady Rocha Ely C. de Menezes Ítalo A. Cavalcanti de Oliveira Cursino B. Jacobina Electrical Engineering Department (DEE) Federal University of Paraíba (UFPB) Cidade Universitária - João Pessoa PB Brazil Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Federal University of Campina Grande (UFCG) Campina Grande PB Brazil

This paper presents a generation system based on the induction generator for wind energy application. The induction generator is connected to single-phase grid through an ac-dc-ac single-phase to three-phase converter. The single-phase converter is composed of two parallel single-phase half-bridge converters. Suitable modelling, including the circulation current, and control strategy are developed. The control of generator is based on the field oriented control. A pulse width-modulation (PWM) technique using a single and double carriers PWM is presented. Proposed topology permits to improve the harmonic distortion. Beside, it can reduce the power losses in the converter. Finally, simulation and experimental results are presented.

关键词： Pulse width modulation Topology Estimation Induction generators Inductance Harmonic distortion

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Three-phase four-wire inverters based on cascaded three-phase converters with four and three legs

Three-phase four-wire inverters based on cascaded three-phas...

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IEEE Energy Conversion Congress and Exposition

作者： Joao P. R. A. Mello Cursino B. Jacobina Mauricio B. R. Correa Post-Graduate Program in Electrical Engineering (PPgEE/COPELE) Federal University of Campina Grande (UFCG) Campina Grande - 58429-900 - Paraiba - Brazil Department of Electrical Engineering (DEE) Federal University of Campina Grande (UFCG) Campina Grande - 58429-900 - Paraiba - Brazil

ISBN: (纸本)9781509007387

This paper presents three-phase converter topologies for four-wire systems. The converters are series connected by three-phase transformers with accessible neutral. They possess a common dc-link, which is the power supply of the system, and two or more converters, where one of them is connected directly to the ac system, and the others cascaded through three-phase transformers. The three-phase transformers have turn ratios that are calculated in order to maximize the number of levels produced by the inverters. The Level-Shifted Pulse Width Modulation technique is developed for two and three cascaded converters, and a control system is used to set the electrical grid currents on desired values. Simulation and experimental results are exposed for configurations with two cascaded converters, each one with either three or four legs.

关键词： three phase transformers Converters AC SYSTEMS cascades phase convertors Phase transformers Electric Power Source Inventors control systems three-phase four-wire Leg grid current

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The Creation and Application of a Simulator in Educational Robotics Classes

The Creation and Application of a Simulator in Educational R...

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IEEE Latin American Robotics Symposium, LARS

作者： Carla Fernandes Sarah Thomaz Renata Pitta Luiz Marcos Goncalves Post-Graduate Program in Electrical and Computer Engineering Federal University of Rio Grande do Norte Natal RN Brazil Department of Computer and Automation Engineering Federal University of Rio Grande do Norte Natal RN Brazil

ISBN: (纸本)9781479934775

Educational robotics classes consist of the use of robots in classes that involve interdisciplinary or social themes, creating innovative learning environments involving the use of such technology. In the usually known approach, educational robotics uses robotics kits. We developed a robotic simulator, called S-Educ, which can be used as an alternative or in association with robotics kits in classes involving the use of robotics. Simulators are not replacements of robotics kits, but an alternative for cases where the kits can not be used or they are not appropriate. Tests were carried out to analyze the use of the simulator, obtaining good results on the application of this simulator in educational robotics classes.

关键词： Robot sensing systems Virtual environments Mobile robots Actuators Wheels

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Four H-bridge based shunt active power filter for three-phase four wire system

Four H-bridge based shunt active power filter for three-phas...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Edgard L. L. Fabricio Cursino B. Jacobina Gregory A. A. Carlos Maurício B. R. Correa Academic Unity of Control and Industrial Processes Federal Institute of Parafba (IFPB) João Pessoa PB Brazil Electrical Engineering Department (DEE) Federal University of Campina Grande (UFCG) Campina Grande PB Brazil Post-Graduate Program in Electrical Engineering COPELE

ISBN: (纸本)9781467395519

This paper proposes a shunt active power filter (SAPF) composed of four H-bridge converters. Each of them is connected by means of isolation transformers. Compared to conventional topologies, the proposed converter permits reducing: dc-link voltage rating, grid current harmonic distortion and/or switching frequency (switching losses). A suitable control strategy to adjust the filter currents as well as dc-link voltage are presented. Two PWM strategies are designed to command the converter according to the reference voltage provided by the controllers. Simulation and experimental results are presented in order to validate theoretical approaches.

关键词： Topology Pulse width modulation Voltage control Harmonic analysis Wires Shunts (electrical) Harmonic distortion

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